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<html><head><title>Delta Electronics, Inc. Model RG-4</title></head>
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<center><img src=../delta1.jpg alt="Delta Electronics, Inc.">
<h2>Model RG-4 Receiver/Generator</h2>
<img src="rg4.jpg" alt="Model RG-4"></center>
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<center><h3>FEATURES</h3>
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<li>Up to 2 Watts Output
<li>5 Microvolt Receiver Sensitivity
<li>120 dB Receiver/Generator Isolation
<li>100 kHz to 29.999 MHz Operating Range
<li>Digital Frequency Synthesizer Design
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<li>Easy Keypad Entry Operation
<li>9 Frequency Storage Registers
<li>Coincidence Detector
<li>Large LCD Frequency Display
<li>Battery Pack for Portable Operation
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<h3>Introduction</h3>
The RG-4 Receiver/Generator is Delta's newest model in its continuing line of precision RF generators and null detection receivers for impedance bridges. The RG-4 is designed as the ideal companion instrument for Delta's <a href="oib1&3.htm">OIB-1 and OIB-3 MF Operating Impedance Bridges</a> and the <a href="oib2data.htm">OIB-2 HF Operating Impedance Bridge</a>. These bridges and the RG-4 form a complete portable impedance measuring system.
<h3>Description</h3>
The RG-4 operating frequency range is from 100 kHz to 29.999 MHz in 1 kHz steps. The generator output is adjustable to 10 V<font size=-2>RMS</font> (2 Watts), 100 kHz to 20 MHz, and 4 V<font size=-2>RMS</font> (0.3 Watts) above 20 MHz. Receiver sensitivity is 5 microvolts with separate front panel gain controls for RF and audio levels. Generator to receiver isolation is greater than 120 dB.
<p>
In noisy environments or under conditions of interfering signals, the generator can be modulated by an internal 50 Hz squarewave and the receiver's coincidence detector circuit will provide clean positive nulls. The generator can also be modulated by an internal 400 Hz signal at 90% modulation. When operated in this manner, the receiver provides both visual and audible null indications.
<p>
Frequency selection is accomplished by a front panel keypad which controls a precision phase locked loop digital frequency synthesizer. The operating frequency is displayed on a large LCD front panel readout. To expedite field tests, nine storage registers provide recall of frequently used frequencies. Frequency increment and decrement keys provide manual sweeps of a chosen frequency in 1, 10, 100 or 1000 kHz steps. Separate 5 kHz increment and decrement keys simplify FCC required antenna impedance sweeps. Rechargeable batteries power the unit for field measurements for two and a half hours minimum at full RF output. The AC supply/charger operates from either 120 or 240 VAC. The power supply will both power the unit and charge the batteries at the same time. Automatic switching to a "trickle" charge mode maintains full charge without battery damage. The lightweight construction combined with a rugged weatherproof aluminum case make this instrument equally at home on the service bench or in the field.
<h3>Applications</h3>
The RG-4 is designed to be used in conjunction with any conventional impedance bridge for antenna measurements in the AM Broadcast and HF bands. A dramatic improvement in signal-to-noise ratio will be realized when the RG-4 is used with the Delta Model <a href="oib1&3.htm">OIB-1</a>, <a href="oib2data.htm">OIB-2</a> and <a href="oib1&3.htm">OIB-3</a> Operating Impedance Bridges. The patented circuit of the OIB series of impedance bridges places the high level generator output directly in parallel with the interfering signals on the antenna.
<p>
With conventional bridges, the generator is attenuated by the measuring network of the bridge before competing with any interfering signals. Such operation can make nulling of the bridge difficult.
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Interference problems are virtually eliminated using the RG-4/OIB combination. The excellent generator to receiver shielding and the dramatic improvement in the signal-to-noise ratio makes the RG-4/OIB combination the consultant's choice for either HF or broadcast antenna impedance measurement applications.
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<caption><strong>SPECIFICATIONS</strong></caption>
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<tr><td><strong>Frequency Range:</strong></td><td>100 kHz to 29.999 MHz in 1 kHz steps</td></tr>
<tr><td><strong>Generator/Receiver Isolation:</strong></td><td>Greater than 120 dB</td></tr>
<tr valign=middle><td><strong>Generator:</strong></td><td><hr></td></tr>
<tr valign="top"><td> Output:</td><td>100 kHz to 20 MHz, Adjustable to 10 V<sub>RMS</sub> (2W) into 50 ohms<br> 20 MHz to 27.5 MHz, Adjustable to 5 V<sub>RMS</sub> (0.5W) into 50 ohms<br>27.5 MHz to 29.999 MHz, Adjustable to 4 V<sub>RMS</sub> (0.3W) into 50 ohms</td></tr>
<tr><td> Modulation:</td><td> 400 Hz 90% AM, 50 Hz squarewave</td></tr>
<tr><td> Output Connector:</td><td>BNC Female</td></tr>
<tr><td><strong>Receiver:</strong></td><td><hr></td></tr>
<tr><td> Type:</td><td>Dual Conversion Superheterodyne with AGC</td></tr>
<tr><td> Sensitivity:</td><td> 5 µV Nominal</td></tr>
<tr valign="top"><td> Selectivity:</td><td> -3 dB Bandwidth: 3.8 kHz<br>-45 dB Bandwidth: 18 kHz</td>
<tr><td> BFO: </td><td>On/Off, 455 kHz ±5 kHz</td></tr>
<tr><td> Audio Output: </td><td>Internal speaker or headphone connected to front panel phone jack</td></tr>
<tr><td> Input Connector: </td><td>BNC Female</td></tr>
<tr><td><strong>Metering:</strong></td><td><hr></td></tr>
<tr valign=top><td> Battery (BAT)</td><td>Battery or power supply voltage</tr>
<tr><td> Generator (GEN)</td><td>Generator output in V<sub>RMS</sub></td></tr>
<tr><td> Receiver (RCVR)</td><td>AGC level or coincidence detector output</td></tr>
<tr><td> </td><td><hr></td></tr>
<tr valign="top"><td><strong>Charging LED:</strong></td><td>Illuminated during battery charging, flashes during trickle charge mode</td></tr>
<tr valign="top"><td><strong>Power:</strong></td><td>Battery Operation - Two Gel/Cells® (or equivalent)<br>
Operating Time (Full Charge) - 2.5 hours nominal at 68° F<br>
Recharge Time - 6 hours nominal<br>
Line Operation - 120/240 VAC ±10%, 47/63 Hz, 35 Watts</td></tr>
<tr valign="top"><td><strong>Temperature:</strong></td><td>Operating: 0° C to +40° C<br>Storage: -10° C to +60° C</td></tr>
<tr valign="top"><td><strong>Size:</strong></td><td>13.5" W (343 mm) x 8" D (203 mm) x 12" H (305 mm)<br> excluding carrying handle</td></tr>
<tr valign="top"><td><strong>Weight:</strong></td><td> 23 pounds (10.5 kg) with batteries</td></tr>
<tr valign="top"><td><strong>Order Numbers:</strong></td><td nowrap>RG-4 with 120 VAC Power Supply: 915-0011-001<br>RG-4 with 240 VAC Power Supply: 915-0011-002</td></tr>
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<font size=1>Gel/Cell is a registered trademark of Johnson Controls, Inc., Globe Battery Division</font>
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<hr>
For additional information on any of our products, please contact <a href="mailto:[email protected]">Sales</a> to discuss your particular requirements:<br>
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<td><strong>Delta Electronics, Inc.<br>
5730 General Washington Drive<br>
P. O. Box 11268<br>Alexandria, VA 22312</strong></td>
<td><strong>Phone: (703) 354-3350<br>
U.S. Toll Free: 1-800-8-DELTA-8 (1-800-833-5828)<br>
Fax: (703) 354-0216<br>
<address>www.deltaelectronics.com</address>
Email: <a href="mailto:[email protected]">[email protected]</a></strong></td>
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<font size=1>The Delta Electronics logo is a registered trademark of Delta Electronics, Inc.</center></font>
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